Because of their ability to convey a variable volume of liquid, their strong self-priming ability, their reversibility, and their capacity to convey liquids that contain solid particles, screw pumps find widespread use in sewage treatment plants for the purpose of transporting water, wet sludge, and flocculant liquid. When choosing screw pumps, you should keep in mind that economy, rationality, and dependability are all important criteria. If careful consideration is not given to the design and selection processes, it will cause problems with the use, management, and maintenance of the system in the future. Therefore, a cost-effective and dependable screw pump that is chosen in response to the specific requirements of the production can not only keep production running smoothly but also cut down on the amount spent on repairs.
1. Determining the appropriate rate of the screw pump's rotation
There is a direct correlation between the rotational speed of the screw pump and the flow rate it produces. Even though the high-speed screw pump is able to increase both the flow and the head in comparison to the low-speed screw pump, it requires a significantly higher amount of power. Because of the high speed, the wear between the rotor and the stator occurs more quickly, which must make theThe screw pump progressive cavity pump food grade breaks down much sooner than it should, and the length of the stator and rotor of the high-speed screw pump is very short. This makes it very easy for them to wear out, which in turn reduces the amount of time the screw pump can be used.
A reducer or a stepless speed regulating mechanism may be used to slow the rotational velocity in order to maintain it within an acceptable range of less than 300 revolutions per minute (rpm). When compared to the high-speed screw pump, the service life can be increased by multiples of the original amount.
Second, the effectiveness of the screw pump in question
On the market, you can choose from a wide variety of screw pumps. The imported screw pumps have a design that is reasonable and are made of excellent materials; however, the price is high, the service is not in place, the price of accessories is high, and the order cycle is long, all of which may disrupt the normal production. run. The majority of products produced domestically are knockoffs or imitations of imported goods, and the quality of these goods varies significantly. Choose products made in the United States that have a low speed, a long lead, high-quality transmission components, and a long rated life when thinking about their cost-effectiveness. This will help you choose products that are made in the United States.
3. Ensure that there is no debris entering the body of the pump.
Because the screw pump's rubber stator will be damaged if it comes into contact with the solid debris that is mixed in with the wet sludge, it is extremely important to ensure that the debris does not enter the cavity of the pump. In front of the pump at many sewage treatment plants is a pulverizer, and these devices are also present in some of these facilities. The grille device or filter screen can prevent loose items from entering the screw pump. However, the grille needs to be removed in a timely manner to prevent the screw pump from becoming clogged.
4. Avoid material breakage
Never under any circumstances should the screw pump be allowed to operate when there is a risk of material failure. As soon as it takes place, the rubber stator will be completely destroyed as a result of the dry friction and stator manufacturing immediate high temperature. As a result, the pulverizer is in good condition, and there are no obstructions in the grille. It is one of the necessary conditions for the screw pump to function normally under these circumstances. In addition to that, the body of some screw pumps is fitted with a material-cutting stop device as an additional safety measure. A vacuum will be created in the cavity as a result of the self-priming function of the screw pump when the material is cut off, and the vacuum device will stop the screw pump once the vacuum is created.
5. Maintain constant outlet pressure
The screw pump is a type of rotary pump that uses positive displacement. When the outlet end is blocked, the pressure will gradually rise until it is higher than the value that was determined to be the maximum acceptable pressure. At this point, the load on the motor is significantly increasing. The load that the relevant parts of the transmission machinery are subjected to will also exceed the design value. If the situation is severe, the motor will catch fire, and the transmission parts will be damaged. It is common practice to install a bypass overflow valve at the outlet of a screw pump in order to prevent any kind of damage to the screw pump itself. This helps to maintain the normal operation of the pump and keeps the outlet pressure from fluctuating.
An Examination of the Factors That Lead to Single Screw Pump Failure
1. The packing has reached an unsafe temperature; this is typically the result of the packing being pressed too tightly, the cooling water being unable to enter the packing, or the shaft surface being damaged. Appropriate steps can be taken, such as easing the compression of the packaging and washing the tube used for sealing. New packing materials need to be used in place of worn ones. Before it is installed, it should be soaked in oil, then loaded in circles, and the incisions should be staggered so that there is less chance of water leaking through them. After the final round of packing has been installed, the gland needs to be tightened, and then the level of tightness needs to be adjusted while the machine is running.
2. The water is not absorbed by the single-screw pump, nor is it drained; the primary causes of this are that the bottom valve is jammed, the water filter is partially clogged, the water absorption height is too high, or the water is leaking; alternatively, this may be the result of improper steering or a blocked impeller flow channel, among other potential causes. After each component of the inspection has been food grade pumps successfully completed in turn, subsequent steps, which may include repairing the bottom valve, removing the silt, adjusting the steering, and cleaning the impeller, may then be taken.
3. Severe vibration caused by the screw pump: the electric rotor may be unbalanced, or the coupling may be poorly combined, and the bearing may be worn and bent; it is also possible that some rotating parts are loose or broken; perhaps the pipeline support is not strong; and so on. Adjustment, repair, reinforcing, and replacing components, as well as a variety of other strategies, are all viable options.
4. The pipeline may have a water or air leak because the nut was not installed with sufficient force during the installation process. Cement or cement slurry that has been mixed with asphalt oil can be applied to the location where there is a leak of air or water if the leak is not too severe. Some damp mud or some gentle soap could be used to make some temporary repairs. In the event that water escapes through the joint, the nut can be tightened by hand. Disassembly is required for significant water loss.
